问题描述：
They talked in a low vioce___heard by the man standing against the wall.
A.so as to not be B.as to be not C.so not as to be D.so as not to be 选什么呢
A.so as to not be B.as to be not C.so not as to be D.so as not to be 选什么呢
问题解答：
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